Malicious PDF — malware analysis report

Static analysis result for SHA-256 4175d1379b42e27d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 18:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9735c428a4000916073ee29854e9cbee SHA-1: 86a6887feeafe8e9d7609ed2e2e204f481056404 SHA-256: 4175d1379b42e27d89ee1de4a7f294ad47b814a4f68286f4b9c024a39d892045
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal User Data

This PDF document exhibits multiple high-severity heuristics indicating malicious intent, including a fake CAPTCHA lure, a password-protected archive lure, and an MFA lure, all designed to deceive the user. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting further supports a phishing or credential harvesting attack pattern. While no scripts were directly extracted, the overall structure and heuristic firings strongly suggest it's part of a phishing campaign, likely aiming to steal credentials or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wagaskar.com/media/gemiwejorolosubefikosiki.pdf In PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/16757696673.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/dixap.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e3420b81---10209454551.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/netoguneviripapisuj.pdfIn PDF document text
    • http://school15-tyumen.ru/f/tupaxopiwiporawenuwulot.pdfIn PDF document text
    • http://alvitraders.com/files/tawejaxujakuvezipan.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/safetalepeveruvi.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/35410130971.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/sebujudoxijofenidalikofod.pdfIn PDF document text
    • http://primavera-bio.cz/userfiles/file/23324634371.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/o6mdhi279aj7158mafsto5b11c/22317366573.pdfIn PDF document text
    • http://bamila.vn/luutru/files/nunurikezudupeja.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/42492174715.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/6c8f35577714c083a96165024ac099f6/zalamirebuvesixifojiga.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ae2871964e90d85900bcf26e2bcf5b4/kobukonupuwufezerinima.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/gorup.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834d71d888c---39741345413.pdfIn PDF document text
    • https://irantruck.ir/data/file/23383954235.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/47738412084.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/50484781845.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f2b477edfcec61e5ac12a10c058eb503/80403006012.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/24237342365.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/17220122809.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/9425c4c434809dae549375022dfacd02/tidiwag.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ac18b36c6d6ba4c1f654e617b811c148/89624683817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=employment+bank+new+list+2019+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 11436 bytes
SHA-256: b1fc6f235f984fec5fde707f3d90f7993d216a240d07543858918ec0d36f11cc
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 18080 bytes
SHA-256: bbb81b9ce3a0f72df4da456a0c35132db8ddb321c67f1739a12e4f28114b5170

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